/**
 * The contents of a Malloy query document.
 */
export type QueryString = string;
/**
 * The contents of a Malloy model document.
 */
export type ModelString = string;
/**
 * A URL whose contents is a Malloy model.
 */
export type ModelURL = URL;
/**
 * A URL whose contents is a Malloy query.
 */
export type QueryURL = URL;
export type InvalidationKey = string | number | Date | null;
/**
 * An object capable of reading the contents of a URL in some context.
 */
export interface URLReader {
    /**
     * Read the contents of the given URL.
     *
     * @param url The URL to read.
     * @return A promise to the contents of the URL.
     */
    readURL: (url: URL) => Promise<string | {
        contents: string;
        invalidationKey?: InvalidationKey;
    }>;
    getInvalidationKey?: (url: URL) => Promise<InvalidationKey>;
}
export interface EventStream {
    emit(id: string, data: any): void;
}